1 /*
2 * Copyright (c) 1997 Greg Ward Larson
3 * Copyright (c) 1997 Silicon Graphics, Inc.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and
6 * its documentation for any purpose is hereby granted without fee, provided
7 * that (i) the above copyright notices and this permission notice appear in
8 * all copies of the software and related documentation, and (ii) the names of
9 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
10 * advertising or publicity relating to the software without the specific,
11 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
12 *
13 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 *
17 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
18 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 * OF THIS SOFTWARE.
23 */
24
25 #include "tiffiop.h"
26 #ifdef LOGLUV_SUPPORT
27
28 /*
29 * TIFF Library.
30 * LogLuv compression support for high dynamic range images.
31 *
32 * Contributed by Greg Larson.
33 *
34 * LogLuv image support uses the TIFF library to store 16 or 10-bit
35 * log luminance values with 8 bits each of u and v or a 14-bit index.
36 *
37 * The codec can take as input and produce as output 32-bit IEEE float values
38 * as well as 16-bit integer values. A 16-bit luminance is interpreted
39 * as a sign bit followed by a 15-bit integer that is converted
40 * to and from a linear magnitude using the transformation:
41 *
42 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
43 *
44 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
45 *
46 * The actual conversion to world luminance units in candelas per sq. meter
47 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
48 * This value is usually set such that a reasonable exposure comes from
49 * clamping decoded luminances above 1 to 1 in the displayed image.
50 *
51 * The 16-bit values for u and v may be converted to real values by dividing
52 * each by 32768. (This allows for negative values, which aren't useful as
53 * far as we know, but are left in case of future improvements in human
54 * color vision.)
55 *
56 * Conversion from (u,v), which is actually the CIE (u',v') system for
57 * you color scientists, is accomplished by the following transformation:
58 *
59 * u = 4*x / (-2*x + 12*y + 3)
60 * v = 9*y / (-2*x + 12*y + 3)
61 *
62 * x = 9*u / (6*u - 16*v + 12)
63 * y = 4*v / (6*u - 16*v + 12)
64 *
65 * This process is greatly simplified by passing 32-bit IEEE floats
66 * for each of three CIE XYZ coordinates. The codec then takes care
67 * of conversion to and from LogLuv, though the application is still
68 * responsible for interpreting the TIFFTAG_STONITS calibration factor.
69 *
70 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
71 * point of (x,y)=(1/3,1/3). However, most color systems assume some other
72 * white point, such as D65, and an absolute color conversion to XYZ then
73 * to another color space with a different white point may introduce an
74 * unwanted color cast to the image. It is often desirable, therefore, to
75 * perform a white point conversion that maps the input white to [1 1 1]
76 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
77 * tag value. A decoder that demands absolute color calibration may use
78 * this white point tag to get back the original colors, but usually it
79 * will be ignored and the new white point will be used instead that
80 * matches the output color space.
81 *
82 * Pixel information is compressed into one of two basic encodings, depending
83 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
84 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
85 * stored as:
86 *
87 * 1 15
88 * |-+---------------|
89 *
90 * COMPRESSION_SGILOG color data is stored as:
91 *
92 * 1 15 8 8
93 * |-+---------------|--------+--------|
94 * S Le ue ve
95 *
96 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
97 *
98 * 10 14
99 * |----------|--------------|
100 * Le' Ce
101 *
102 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
103 * encoded as an index for optimal color resolution. The 10 log bits are
104 * defined by the following conversions:
105 *
106 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
107 *
108 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
109 *
110 * The 10 bits of the smaller format may be converted into the 15 bits of
111 * the larger format by multiplying by 4 and adding 13314. Obviously,
112 * a smaller range of magnitudes is covered (about 5 orders of magnitude
113 * instead of 38), and the lack of a sign bit means that negative luminances
114 * are not allowed. (Well, they aren't allowed in the real world, either,
115 * but they are useful for certain types of image processing.)
116 *
117 * The desired user format is controlled by the setting the internal
118 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
119 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
120 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
121 * Raw data i/o is also possible using:
122 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
123 * In addition, the following decoding is provided for ease of display:
124 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
125 *
126 * For grayscale images, we provide the following data formats:
127 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
128 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
129 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
130 *
131 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
132 * scheme by separating the logL, u and v bytes for each row and applying
133 * a PackBits type of compression. Since the 24-bit encoding is not
134 * adaptive, the 32-bit color format takes less space in many cases.
135 *
136 * Further control is provided over the conversion from higher-resolution
137 * formats to final encoded values through the pseudo tag
138 * TIFFTAG_SGILOGENCODE:
139 * SGILOGENCODE_NODITHER = do not dither encoded values
140 * SGILOGENCODE_RANDITHER = apply random dithering during encoding
141 *
142 * The default value of this tag is SGILOGENCODE_NODITHER for
143 * COMPRESSION_SGILOG to maximize run-length encoding and
144 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
145 * quantization errors into noise.
146 */
147
148 #include <stdio.h>
149 #include <stdlib.h>
150 #include <math.h>
151
152 /*
153 * State block for each open TIFF
154 * file using LogLuv compression/decompression.
155 */
156 typedef struct logLuvState LogLuvState;
157
158 struct logLuvState {
159 int encoder_state; /* 1 if encoder correctly initialized */
160 int user_datafmt; /* user data format */
161 int encode_meth; /* encoding method */
162 int pixel_size; /* bytes per pixel */
163
164 uint8* tbuf; /* translation buffer */
165 tmsize_t tbuflen; /* buffer length */
166 void (*tfunc)(LogLuvState*, uint8*, tmsize_t);
167
168 TIFFVSetMethod vgetparent; /* super-class method */
169 TIFFVSetMethod vsetparent; /* super-class method */
170 };
171
172 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
173 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
174
175 #define SGILOGDATAFMT_UNKNOWN -1
176
177 #define MINRUN 4 /* minimum run length */
178
179 /*
180 * Decode a string of 16-bit gray pixels.
181 */
182 static int
LogL16Decode(TIFF * tif,uint8 * op,tmsize_t occ,uint16 s)183 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
184 {
185 static const char module[] = "LogL16Decode";
186 LogLuvState* sp = DecoderState(tif);
187 int shft;
188 tmsize_t i;
189 tmsize_t npixels;
190 unsigned char* bp;
191 int16* tp;
192 int16 b;
193 tmsize_t cc;
194 int rc;
195
196 assert(s == 0);
197 assert(sp != NULL);
198
199 npixels = occ / sp->pixel_size;
200
201 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
202 tp = (int16*) op;
203 else {
204 if(sp->tbuflen < npixels) {
205 TIFFErrorExt(tif->tif_clientdata, module,
206 "Translation buffer too short");
207 return (0);
208 }
209 tp = (int16*) sp->tbuf;
210 }
211 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
212
213 bp = (unsigned char*) tif->tif_rawcp;
214 cc = tif->tif_rawcc;
215 /* get each byte string */
216 for (shft = 8; shft >= 0; shft -=8) {
217 for (i = 0; i < npixels && cc > 0; ) {
218 if (*bp >= 128) { /* run */
219 if( cc < 2 )
220 break;
221 rc = *bp++ + (2-128);
222 b = (int16)(*bp++ << shft);
223 cc -= 2;
224 while (rc-- && i < npixels)
225 tp[i++] |= b;
226 } else { /* non-run */
227 rc = *bp++; /* nul is noop */
228 while (--cc && rc-- && i < npixels)
229 tp[i++] |= (int16)*bp++ << shft;
230 }
231 }
232 if (i != npixels) {
233 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
234 TIFFErrorExt(tif->tif_clientdata, module,
235 "Not enough data at row %lu (short %I64d pixels)",
236 (unsigned long) tif->tif_row,
237 (unsigned __int64) (npixels - i));
238 #else
239 TIFFErrorExt(tif->tif_clientdata, module,
240 "Not enough data at row %lu (short %llu pixels)",
241 (unsigned long) tif->tif_row,
242 (unsigned long long) (npixels - i));
243 #endif
244 tif->tif_rawcp = (uint8*) bp;
245 tif->tif_rawcc = cc;
246 return (0);
247 }
248 }
249 (*sp->tfunc)(sp, op, npixels);
250 tif->tif_rawcp = (uint8*) bp;
251 tif->tif_rawcc = cc;
252 return (1);
253 }
254
255 /*
256 * Decode a string of 24-bit pixels.
257 */
258 static int
LogLuvDecode24(TIFF * tif,uint8 * op,tmsize_t occ,uint16 s)259 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
260 {
261 static const char module[] = "LogLuvDecode24";
262 LogLuvState* sp = DecoderState(tif);
263 tmsize_t cc;
264 tmsize_t i;
265 tmsize_t npixels;
266 unsigned char* bp;
267 uint32* tp;
268
269 assert(s == 0);
270 assert(sp != NULL);
271
272 npixels = occ / sp->pixel_size;
273
274 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
275 tp = (uint32 *)op;
276 else {
277 if(sp->tbuflen < npixels) {
278 TIFFErrorExt(tif->tif_clientdata, module,
279 "Translation buffer too short");
280 return (0);
281 }
282 tp = (uint32 *) sp->tbuf;
283 }
284 /* copy to array of uint32 */
285 bp = (unsigned char*) tif->tif_rawcp;
286 cc = tif->tif_rawcc;
287 for (i = 0; i < npixels && cc >= 3; i++) {
288 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
289 bp += 3;
290 cc -= 3;
291 }
292 tif->tif_rawcp = (uint8*) bp;
293 tif->tif_rawcc = cc;
294 if (i != npixels) {
295 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
296 TIFFErrorExt(tif->tif_clientdata, module,
297 "Not enough data at row %lu (short %I64d pixels)",
298 (unsigned long) tif->tif_row,
299 (unsigned __int64) (npixels - i));
300 #else
301 TIFFErrorExt(tif->tif_clientdata, module,
302 "Not enough data at row %lu (short %llu pixels)",
303 (unsigned long) tif->tif_row,
304 (unsigned long long) (npixels - i));
305 #endif
306 return (0);
307 }
308 (*sp->tfunc)(sp, op, npixels);
309 return (1);
310 }
311
312 /*
313 * Decode a string of 32-bit pixels.
314 */
315 static int
LogLuvDecode32(TIFF * tif,uint8 * op,tmsize_t occ,uint16 s)316 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
317 {
318 static const char module[] = "LogLuvDecode32";
319 LogLuvState* sp;
320 int shft;
321 tmsize_t i;
322 tmsize_t npixels;
323 unsigned char* bp;
324 uint32* tp;
325 uint32 b;
326 tmsize_t cc;
327 int rc;
328
329 assert(s == 0);
330 sp = DecoderState(tif);
331 assert(sp != NULL);
332
333 npixels = occ / sp->pixel_size;
334
335 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
336 tp = (uint32*) op;
337 else {
338 if(sp->tbuflen < npixels) {
339 TIFFErrorExt(tif->tif_clientdata, module,
340 "Translation buffer too short");
341 return (0);
342 }
343 tp = (uint32*) sp->tbuf;
344 }
345 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
346
347 bp = (unsigned char*) tif->tif_rawcp;
348 cc = tif->tif_rawcc;
349 /* get each byte string */
350 for (shft = 24; shft >= 0; shft -=8) {
351 for (i = 0; i < npixels && cc > 0; ) {
352 if (*bp >= 128) { /* run */
353 if( cc < 2 )
354 break;
355 rc = *bp++ + (2-128);
356 b = (uint32)*bp++ << shft;
357 cc -= 2;
358 while (rc-- && i < npixels)
359 tp[i++] |= b;
360 } else { /* non-run */
361 rc = *bp++; /* nul is noop */
362 while (--cc && rc-- && i < npixels)
363 tp[i++] |= (uint32)*bp++ << shft;
364 }
365 }
366 if (i != npixels) {
367 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
368 TIFFErrorExt(tif->tif_clientdata, module,
369 "Not enough data at row %lu (short %I64d pixels)",
370 (unsigned long) tif->tif_row,
371 (unsigned __int64) (npixels - i));
372 #else
373 TIFFErrorExt(tif->tif_clientdata, module,
374 "Not enough data at row %lu (short %llu pixels)",
375 (unsigned long) tif->tif_row,
376 (unsigned long long) (npixels - i));
377 #endif
378 tif->tif_rawcp = (uint8*) bp;
379 tif->tif_rawcc = cc;
380 return (0);
381 }
382 }
383 (*sp->tfunc)(sp, op, npixels);
384 tif->tif_rawcp = (uint8*) bp;
385 tif->tif_rawcc = cc;
386 return (1);
387 }
388
389 /*
390 * Decode a strip of pixels. We break it into rows to
391 * maintain synchrony with the encode algorithm, which
392 * is row by row.
393 */
394 static int
LogLuvDecodeStrip(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)395 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
396 {
397 tmsize_t rowlen = TIFFScanlineSize(tif);
398
399 if (rowlen == 0)
400 return 0;
401
402 assert(cc%rowlen == 0);
403 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
404 bp += rowlen;
405 cc -= rowlen;
406 }
407 return (cc == 0);
408 }
409
410 /*
411 * Decode a tile of pixels. We break it into rows to
412 * maintain synchrony with the encode algorithm, which
413 * is row by row.
414 */
415 static int
LogLuvDecodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)416 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
417 {
418 tmsize_t rowlen = TIFFTileRowSize(tif);
419
420 if (rowlen == 0)
421 return 0;
422
423 assert(cc%rowlen == 0);
424 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
425 bp += rowlen;
426 cc -= rowlen;
427 }
428 return (cc == 0);
429 }
430
431 /*
432 * Encode a row of 16-bit pixels.
433 */
434 static int
LogL16Encode(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)435 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
436 {
437 static const char module[] = "LogL16Encode";
438 LogLuvState* sp = EncoderState(tif);
439 int shft;
440 tmsize_t i;
441 tmsize_t j;
442 tmsize_t npixels;
443 uint8* op;
444 int16* tp;
445 int16 b;
446 tmsize_t occ;
447 int rc=0, mask;
448 tmsize_t beg;
449
450 assert(s == 0);
451 assert(sp != NULL);
452 npixels = cc / sp->pixel_size;
453
454 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
455 tp = (int16*) bp;
456 else {
457 tp = (int16*) sp->tbuf;
458 if(sp->tbuflen < npixels) {
459 TIFFErrorExt(tif->tif_clientdata, module,
460 "Translation buffer too short");
461 return (0);
462 }
463 (*sp->tfunc)(sp, bp, npixels);
464 }
465 /* compress each byte string */
466 op = tif->tif_rawcp;
467 occ = tif->tif_rawdatasize - tif->tif_rawcc;
468 for (shft = 8; shft >= 0; shft -=8) {
469 for (i = 0; i < npixels; i += rc) {
470 if (occ < 4) {
471 tif->tif_rawcp = op;
472 tif->tif_rawcc = tif->tif_rawdatasize - occ;
473 if (!TIFFFlushData1(tif))
474 return (0);
475 op = tif->tif_rawcp;
476 occ = tif->tif_rawdatasize - tif->tif_rawcc;
477 }
478 mask = 0xff << shft; /* find next run */
479 for (beg = i; beg < npixels; beg += rc) {
480 b = (int16) (tp[beg] & mask);
481 rc = 1;
482 while (rc < 127+2 && beg+rc < npixels &&
483 (tp[beg+rc] & mask) == b)
484 rc++;
485 if (rc >= MINRUN)
486 break; /* long enough */
487 }
488 if (beg-i > 1 && beg-i < MINRUN) {
489 b = (int16) (tp[i] & mask);/*check short run */
490 j = i+1;
491 while ((tp[j++] & mask) == b)
492 if (j == beg) {
493 *op++ = (uint8)(128-2+j-i);
494 *op++ = (uint8)(b >> shft);
495 occ -= 2;
496 i = beg;
497 break;
498 }
499 }
500 while (i < beg) { /* write out non-run */
501 if ((j = beg-i) > 127) j = 127;
502 if (occ < j+3) {
503 tif->tif_rawcp = op;
504 tif->tif_rawcc = tif->tif_rawdatasize - occ;
505 if (!TIFFFlushData1(tif))
506 return (0);
507 op = tif->tif_rawcp;
508 occ = tif->tif_rawdatasize - tif->tif_rawcc;
509 }
510 *op++ = (uint8) j; occ--;
511 while (j--) {
512 *op++ = (uint8) (tp[i++] >> shft & 0xff);
513 occ--;
514 }
515 }
516 if (rc >= MINRUN) { /* write out run */
517 *op++ = (uint8) (128-2+rc);
518 *op++ = (uint8) (tp[beg] >> shft & 0xff);
519 occ -= 2;
520 } else
521 rc = 0;
522 }
523 }
524 tif->tif_rawcp = op;
525 tif->tif_rawcc = tif->tif_rawdatasize - occ;
526
527 return (1);
528 }
529
530 /*
531 * Encode a row of 24-bit pixels.
532 */
533 static int
LogLuvEncode24(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)534 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
535 {
536 static const char module[] = "LogLuvEncode24";
537 LogLuvState* sp = EncoderState(tif);
538 tmsize_t i;
539 tmsize_t npixels;
540 tmsize_t occ;
541 uint8* op;
542 uint32* tp;
543
544 assert(s == 0);
545 assert(sp != NULL);
546 npixels = cc / sp->pixel_size;
547
548 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
549 tp = (uint32*) bp;
550 else {
551 tp = (uint32*) sp->tbuf;
552 if(sp->tbuflen < npixels) {
553 TIFFErrorExt(tif->tif_clientdata, module,
554 "Translation buffer too short");
555 return (0);
556 }
557 (*sp->tfunc)(sp, bp, npixels);
558 }
559 /* write out encoded pixels */
560 op = tif->tif_rawcp;
561 occ = tif->tif_rawdatasize - tif->tif_rawcc;
562 for (i = npixels; i--; ) {
563 if (occ < 3) {
564 tif->tif_rawcp = op;
565 tif->tif_rawcc = tif->tif_rawdatasize - occ;
566 if (!TIFFFlushData1(tif))
567 return (0);
568 op = tif->tif_rawcp;
569 occ = tif->tif_rawdatasize - tif->tif_rawcc;
570 }
571 *op++ = (uint8)(*tp >> 16);
572 *op++ = (uint8)(*tp >> 8 & 0xff);
573 *op++ = (uint8)(*tp++ & 0xff);
574 occ -= 3;
575 }
576 tif->tif_rawcp = op;
577 tif->tif_rawcc = tif->tif_rawdatasize - occ;
578
579 return (1);
580 }
581
582 /*
583 * Encode a row of 32-bit pixels.
584 */
585 static int
LogLuvEncode32(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)586 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
587 {
588 static const char module[] = "LogLuvEncode32";
589 LogLuvState* sp = EncoderState(tif);
590 int shft;
591 tmsize_t i;
592 tmsize_t j;
593 tmsize_t npixels;
594 uint8* op;
595 uint32* tp;
596 uint32 b;
597 tmsize_t occ;
598 int rc=0, mask;
599 tmsize_t beg;
600
601 assert(s == 0);
602 assert(sp != NULL);
603
604 npixels = cc / sp->pixel_size;
605
606 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
607 tp = (uint32*) bp;
608 else {
609 tp = (uint32*) sp->tbuf;
610 if(sp->tbuflen < npixels) {
611 TIFFErrorExt(tif->tif_clientdata, module,
612 "Translation buffer too short");
613 return (0);
614 }
615 (*sp->tfunc)(sp, bp, npixels);
616 }
617 /* compress each byte string */
618 op = tif->tif_rawcp;
619 occ = tif->tif_rawdatasize - tif->tif_rawcc;
620 for (shft = 24; shft >= 0; shft -=8) {
621 for (i = 0; i < npixels; i += rc) {
622 if (occ < 4) {
623 tif->tif_rawcp = op;
624 tif->tif_rawcc = tif->tif_rawdatasize - occ;
625 if (!TIFFFlushData1(tif))
626 return (0);
627 op = tif->tif_rawcp;
628 occ = tif->tif_rawdatasize - tif->tif_rawcc;
629 }
630 mask = 0xff << shft; /* find next run */
631 for (beg = i; beg < npixels; beg += rc) {
632 b = tp[beg] & mask;
633 rc = 1;
634 while (rc < 127+2 && beg+rc < npixels &&
635 (tp[beg+rc] & mask) == b)
636 rc++;
637 if (rc >= MINRUN)
638 break; /* long enough */
639 }
640 if (beg-i > 1 && beg-i < MINRUN) {
641 b = tp[i] & mask; /* check short run */
642 j = i+1;
643 while ((tp[j++] & mask) == b)
644 if (j == beg) {
645 *op++ = (uint8)(128-2+j-i);
646 *op++ = (uint8)(b >> shft);
647 occ -= 2;
648 i = beg;
649 break;
650 }
651 }
652 while (i < beg) { /* write out non-run */
653 if ((j = beg-i) > 127) j = 127;
654 if (occ < j+3) {
655 tif->tif_rawcp = op;
656 tif->tif_rawcc = tif->tif_rawdatasize - occ;
657 if (!TIFFFlushData1(tif))
658 return (0);
659 op = tif->tif_rawcp;
660 occ = tif->tif_rawdatasize - tif->tif_rawcc;
661 }
662 *op++ = (uint8) j; occ--;
663 while (j--) {
664 *op++ = (uint8)(tp[i++] >> shft & 0xff);
665 occ--;
666 }
667 }
668 if (rc >= MINRUN) { /* write out run */
669 *op++ = (uint8) (128-2+rc);
670 *op++ = (uint8)(tp[beg] >> shft & 0xff);
671 occ -= 2;
672 } else
673 rc = 0;
674 }
675 }
676 tif->tif_rawcp = op;
677 tif->tif_rawcc = tif->tif_rawdatasize - occ;
678
679 return (1);
680 }
681
682 /*
683 * Encode a strip of pixels. We break it into rows to
684 * avoid encoding runs across row boundaries.
685 */
686 static int
LogLuvEncodeStrip(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)687 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
688 {
689 tmsize_t rowlen = TIFFScanlineSize(tif);
690
691 if (rowlen == 0)
692 return 0;
693
694 assert(cc%rowlen == 0);
695 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
696 bp += rowlen;
697 cc -= rowlen;
698 }
699 return (cc == 0);
700 }
701
702 /*
703 * Encode a tile of pixels. We break it into rows to
704 * avoid encoding runs across row boundaries.
705 */
706 static int
LogLuvEncodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)707 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
708 {
709 tmsize_t rowlen = TIFFTileRowSize(tif);
710
711 if (rowlen == 0)
712 return 0;
713
714 assert(cc%rowlen == 0);
715 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
716 bp += rowlen;
717 cc -= rowlen;
718 }
719 return (cc == 0);
720 }
721
722 /*
723 * Encode/Decode functions for converting to and from user formats.
724 */
725
726 #include "uvcode.h"
727
728 #ifndef UVSCALE
729 #define U_NEU 0.210526316
730 #define V_NEU 0.473684211
731 #define UVSCALE 410.
732 #endif
733
734 #ifndef M_LN2
735 #define M_LN2 0.69314718055994530942
736 #endif
737 #ifndef M_PI
738 #define M_PI 3.14159265358979323846
739 #endif
740 #undef log2 /* Conflict with C'99 function */
741 #define log2(x) ((1./M_LN2)*log(x))
742 #undef exp2 /* Conflict with C'99 function */
743 #define exp2(x) exp(M_LN2*(x))
744
745 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
746 (int)(x) : \
747 (int)((x) + rand()*(1./RAND_MAX) - .5))
748
749 #if !LOGLUV_PUBLIC
750 static
751 #endif
752 double
LogL16toY(int p16)753 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
754 {
755 int Le = p16 & 0x7fff;
756 double Y;
757
758 if (!Le)
759 return (0.);
760 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
761 return (!(p16 & 0x8000) ? Y : -Y);
762 }
763
764 #if !LOGLUV_PUBLIC
765 static
766 #endif
767 int
LogL16fromY(double Y,int em)768 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
769 {
770 if (Y >= 1.8371976e19)
771 return (0x7fff);
772 if (Y <= -1.8371976e19)
773 return (0xffff);
774 if (Y > 5.4136769e-20)
775 return itrunc(256.*(log2(Y) + 64.), em);
776 if (Y < -5.4136769e-20)
777 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
778 return (0);
779 }
780
781 static void
L16toY(LogLuvState * sp,uint8 * op,tmsize_t n)782 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
783 {
784 int16* l16 = (int16*) sp->tbuf;
785 float* yp = (float*) op;
786
787 while (n-- > 0)
788 *yp++ = (float)LogL16toY(*l16++);
789 }
790
791 static void
L16toGry(LogLuvState * sp,uint8 * op,tmsize_t n)792 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
793 {
794 int16* l16 = (int16*) sp->tbuf;
795 uint8* gp = (uint8*) op;
796
797 while (n-- > 0) {
798 double Y = LogL16toY(*l16++);
799 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
800 }
801 }
802
803 static void
L16fromY(LogLuvState * sp,uint8 * op,tmsize_t n)804 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
805 {
806 int16* l16 = (int16*) sp->tbuf;
807 float* yp = (float*) op;
808
809 while (n-- > 0)
810 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
811 }
812
813 #if !LOGLUV_PUBLIC
814 static
815 #endif
816 void
XYZtoRGB24(float xyz[3],uint8 rgb[3])817 XYZtoRGB24(float xyz[3], uint8 rgb[3])
818 {
819 double r, g, b;
820 /* assume CCIR-709 primaries */
821 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
822 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
823 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
824 /* assume 2.0 gamma for speed */
825 /* could use integer sqrt approx., but this is probably faster */
826 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
827 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
828 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
829 }
830
831 #if !LOGLUV_PUBLIC
832 static
833 #endif
834 double
LogL10toY(int p10)835 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
836 {
837 if (p10 == 0)
838 return (0.);
839 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
840 }
841
842 #if !LOGLUV_PUBLIC
843 static
844 #endif
845 int
LogL10fromY(double Y,int em)846 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
847 {
848 if (Y >= 15.742)
849 return (0x3ff);
850 else if (Y <= .00024283)
851 return (0);
852 else
853 return itrunc(64.*(log2(Y) + 12.), em);
854 }
855
856 #define NANGLES 100
857 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
858 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
859
860 static int
oog_encode(double u,double v)861 oog_encode(double u, double v) /* encode out-of-gamut chroma */
862 {
863 static int oog_table[NANGLES];
864 static int initialized = 0;
865 register int i;
866
867 if (!initialized) { /* set up perimeter table */
868 double eps[NANGLES], ua, va, ang, epsa;
869 int ui, vi, ustep;
870 for (i = NANGLES; i--; )
871 eps[i] = 2.;
872 for (vi = UV_NVS; vi--; ) {
873 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
874 ustep = uv_row[vi].nus-1;
875 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
876 ustep = 1;
877 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
878 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
879 ang = uv2ang(ua, va);
880 i = (int) ang;
881 epsa = fabs(ang - (i+.5));
882 if (epsa < eps[i]) {
883 oog_table[i] = uv_row[vi].ncum + ui;
884 eps[i] = epsa;
885 }
886 }
887 }
888 for (i = NANGLES; i--; ) /* fill any holes */
889 if (eps[i] > 1.5) {
890 int i1, i2;
891 for (i1 = 1; i1 < NANGLES/2; i1++)
892 if (eps[(i+i1)%NANGLES] < 1.5)
893 break;
894 for (i2 = 1; i2 < NANGLES/2; i2++)
895 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
896 break;
897 if (i1 < i2)
898 oog_table[i] =
899 oog_table[(i+i1)%NANGLES];
900 else
901 oog_table[i] =
902 oog_table[(i+NANGLES-i2)%NANGLES];
903 }
904 initialized = 1;
905 }
906 i = (int) uv2ang(u, v); /* look up hue angle */
907 return (oog_table[i]);
908 }
909
910 #undef uv2ang
911 #undef NANGLES
912
913 #if !LOGLUV_PUBLIC
914 static
915 #endif
916 int
uv_encode(double u,double v,int em)917 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
918 {
919 register int vi, ui;
920
921 if (v < UV_VSTART)
922 return oog_encode(u, v);
923 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
924 if (vi >= UV_NVS)
925 return oog_encode(u, v);
926 if (u < uv_row[vi].ustart)
927 return oog_encode(u, v);
928 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
929 if (ui >= uv_row[vi].nus)
930 return oog_encode(u, v);
931
932 return (uv_row[vi].ncum + ui);
933 }
934
935 #if !LOGLUV_PUBLIC
936 static
937 #endif
938 int
uv_decode(double * up,double * vp,int c)939 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
940 {
941 int upper, lower;
942 register int ui, vi;
943
944 if (c < 0 || c >= UV_NDIVS)
945 return (-1);
946 lower = 0; /* binary search */
947 upper = UV_NVS;
948 while (upper - lower > 1) {
949 vi = (lower + upper) >> 1;
950 ui = c - uv_row[vi].ncum;
951 if (ui > 0)
952 lower = vi;
953 else if (ui < 0)
954 upper = vi;
955 else {
956 lower = vi;
957 break;
958 }
959 }
960 vi = lower;
961 ui = c - uv_row[vi].ncum;
962 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
963 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
964 return (0);
965 }
966
967 #if !LOGLUV_PUBLIC
968 static
969 #endif
970 void
LogLuv24toXYZ(uint32 p,float XYZ[3])971 LogLuv24toXYZ(uint32 p, float XYZ[3])
972 {
973 int Ce;
974 double L, u, v, s, x, y;
975 /* decode luminance */
976 L = LogL10toY(p>>14 & 0x3ff);
977 if (L <= 0.) {
978 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
979 return;
980 }
981 /* decode color */
982 Ce = p & 0x3fff;
983 if (uv_decode(&u, &v, Ce) < 0) {
984 u = U_NEU; v = V_NEU;
985 }
986 s = 1./(6.*u - 16.*v + 12.);
987 x = 9.*u * s;
988 y = 4.*v * s;
989 /* convert to XYZ */
990 XYZ[0] = (float)(x/y * L);
991 XYZ[1] = (float)L;
992 XYZ[2] = (float)((1.-x-y)/y * L);
993 }
994
995 #if !LOGLUV_PUBLIC
996 static
997 #endif
998 uint32
LogLuv24fromXYZ(float XYZ[3],int em)999 LogLuv24fromXYZ(float XYZ[3], int em)
1000 {
1001 int Le, Ce;
1002 double u, v, s;
1003 /* encode luminance */
1004 Le = LogL10fromY(XYZ[1], em);
1005 /* encode color */
1006 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1007 if (!Le || s <= 0.) {
1008 u = U_NEU;
1009 v = V_NEU;
1010 } else {
1011 u = 4.*XYZ[0] / s;
1012 v = 9.*XYZ[1] / s;
1013 }
1014 Ce = uv_encode(u, v, em);
1015 if (Ce < 0) /* never happens */
1016 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1017 /* combine encodings */
1018 return (Le << 14 | Ce);
1019 }
1020
1021 static void
Luv24toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1022 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1023 {
1024 uint32* luv = (uint32*) sp->tbuf;
1025 float* xyz = (float*) op;
1026
1027 while (n-- > 0) {
1028 LogLuv24toXYZ(*luv, xyz);
1029 xyz += 3;
1030 luv++;
1031 }
1032 }
1033
1034 static void
Luv24toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1035 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1036 {
1037 uint32* luv = (uint32*) sp->tbuf;
1038 int16* luv3 = (int16*) op;
1039
1040 while (n-- > 0) {
1041 double u, v;
1042
1043 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
1044 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
1045 u = U_NEU;
1046 v = V_NEU;
1047 }
1048 *luv3++ = (int16)(u * (1L<<15));
1049 *luv3++ = (int16)(v * (1L<<15));
1050 luv++;
1051 }
1052 }
1053
1054 static void
Luv24toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1055 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1056 {
1057 uint32* luv = (uint32*) sp->tbuf;
1058 uint8* rgb = (uint8*) op;
1059
1060 while (n-- > 0) {
1061 float xyz[3];
1062
1063 LogLuv24toXYZ(*luv++, xyz);
1064 XYZtoRGB24(xyz, rgb);
1065 rgb += 3;
1066 }
1067 }
1068
1069 static void
Luv24fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1070 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1071 {
1072 uint32* luv = (uint32*) sp->tbuf;
1073 float* xyz = (float*) op;
1074
1075 while (n-- > 0) {
1076 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1077 xyz += 3;
1078 }
1079 }
1080
1081 static void
Luv24fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1082 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1083 {
1084 uint32* luv = (uint32*) sp->tbuf;
1085 int16* luv3 = (int16*) op;
1086
1087 while (n-- > 0) {
1088 int Le, Ce;
1089
1090 if (luv3[0] <= 0)
1091 Le = 0;
1092 else if (luv3[0] >= (1<<12)+3314)
1093 Le = (1<<10) - 1;
1094 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1095 Le = (luv3[0]-3314) >> 2;
1096 else
1097 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1098
1099 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1100 sp->encode_meth);
1101 if (Ce < 0) /* never happens */
1102 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1103 *luv++ = (uint32)Le << 14 | Ce;
1104 luv3 += 3;
1105 }
1106 }
1107
1108 #if !LOGLUV_PUBLIC
1109 static
1110 #endif
1111 void
LogLuv32toXYZ(uint32 p,float XYZ[3])1112 LogLuv32toXYZ(uint32 p, float XYZ[3])
1113 {
1114 double L, u, v, s, x, y;
1115 /* decode luminance */
1116 L = LogL16toY((int)p >> 16);
1117 if (L <= 0.) {
1118 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1119 return;
1120 }
1121 /* decode color */
1122 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1123 v = 1./UVSCALE * ((p & 0xff) + .5);
1124 s = 1./(6.*u - 16.*v + 12.);
1125 x = 9.*u * s;
1126 y = 4.*v * s;
1127 /* convert to XYZ */
1128 XYZ[0] = (float)(x/y * L);
1129 XYZ[1] = (float)L;
1130 XYZ[2] = (float)((1.-x-y)/y * L);
1131 }
1132
1133 #if !LOGLUV_PUBLIC
1134 static
1135 #endif
1136 uint32
LogLuv32fromXYZ(float XYZ[3],int em)1137 LogLuv32fromXYZ(float XYZ[3], int em)
1138 {
1139 unsigned int Le, ue, ve;
1140 double u, v, s;
1141 /* encode luminance */
1142 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1143 /* encode color */
1144 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1145 if (!Le || s <= 0.) {
1146 u = U_NEU;
1147 v = V_NEU;
1148 } else {
1149 u = 4.*XYZ[0] / s;
1150 v = 9.*XYZ[1] / s;
1151 }
1152 if (u <= 0.) ue = 0;
1153 else ue = itrunc(UVSCALE*u, em);
1154 if (ue > 255) ue = 255;
1155 if (v <= 0.) ve = 0;
1156 else ve = itrunc(UVSCALE*v, em);
1157 if (ve > 255) ve = 255;
1158 /* combine encodings */
1159 return (Le << 16 | ue << 8 | ve);
1160 }
1161
1162 static void
Luv32toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1163 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1164 {
1165 uint32* luv = (uint32*) sp->tbuf;
1166 float* xyz = (float*) op;
1167
1168 while (n-- > 0) {
1169 LogLuv32toXYZ(*luv++, xyz);
1170 xyz += 3;
1171 }
1172 }
1173
1174 static void
Luv32toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1175 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1176 {
1177 uint32* luv = (uint32*) sp->tbuf;
1178 int16* luv3 = (int16*) op;
1179
1180 while (n-- > 0) {
1181 double u, v;
1182
1183 *luv3++ = (int16)(*luv >> 16);
1184 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1185 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1186 *luv3++ = (int16)(u * (1L<<15));
1187 *luv3++ = (int16)(v * (1L<<15));
1188 luv++;
1189 }
1190 }
1191
1192 static void
Luv32toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1193 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1194 {
1195 uint32* luv = (uint32*) sp->tbuf;
1196 uint8* rgb = (uint8*) op;
1197
1198 while (n-- > 0) {
1199 float xyz[3];
1200
1201 LogLuv32toXYZ(*luv++, xyz);
1202 XYZtoRGB24(xyz, rgb);
1203 rgb += 3;
1204 }
1205 }
1206
1207 static void
Luv32fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1208 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1209 {
1210 uint32* luv = (uint32*) sp->tbuf;
1211 float* xyz = (float*) op;
1212
1213 while (n-- > 0) {
1214 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1215 xyz += 3;
1216 }
1217 }
1218
1219 static void
Luv32fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1220 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1221 {
1222 uint32* luv = (uint32*) sp->tbuf;
1223 int16* luv3 = (int16*) op;
1224
1225 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1226 while (n-- > 0) {
1227 *luv++ = (uint32)luv3[0] << 16 |
1228 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1229 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1230 luv3 += 3;
1231 }
1232 return;
1233 }
1234 while (n-- > 0) {
1235 *luv++ = (uint32)luv3[0] << 16 |
1236 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1237 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1238 luv3 += 3;
1239 }
1240 }
1241
1242 static void
_logLuvNop(LogLuvState * sp,uint8 * op,tmsize_t n)1243 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1244 {
1245 (void) sp; (void) op; (void) n;
1246 }
1247
1248 static int
LogL16GuessDataFmt(TIFFDirectory * td)1249 LogL16GuessDataFmt(TIFFDirectory *td)
1250 {
1251 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1252 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1253 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1254 return (SGILOGDATAFMT_FLOAT);
1255 case PACK(1, 16, SAMPLEFORMAT_VOID):
1256 case PACK(1, 16, SAMPLEFORMAT_INT):
1257 case PACK(1, 16, SAMPLEFORMAT_UINT):
1258 return (SGILOGDATAFMT_16BIT);
1259 case PACK(1, 8, SAMPLEFORMAT_VOID):
1260 case PACK(1, 8, SAMPLEFORMAT_UINT):
1261 return (SGILOGDATAFMT_8BIT);
1262 }
1263 #undef PACK
1264 return (SGILOGDATAFMT_UNKNOWN);
1265 }
1266
1267
1268 #define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0))
1269 #define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1)
1270
1271 static tmsize_t
multiply_ms(tmsize_t m1,tmsize_t m2)1272 multiply_ms(tmsize_t m1, tmsize_t m2)
1273 {
1274 if( m1 == 0 || m2 > TIFF_TMSIZE_T_MAX / m1 )
1275 return 0;
1276 return m1 * m2;
1277 }
1278
1279 static int
LogL16InitState(TIFF * tif)1280 LogL16InitState(TIFF* tif)
1281 {
1282 static const char module[] = "LogL16InitState";
1283 TIFFDirectory *td = &tif->tif_dir;
1284 LogLuvState* sp = DecoderState(tif);
1285
1286 assert(sp != NULL);
1287 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1288
1289 if( td->td_samplesperpixel != 1 )
1290 {
1291 TIFFErrorExt(tif->tif_clientdata, module,
1292 "Sorry, can not handle LogL image with %s=%d",
1293 "Samples/pixel", td->td_samplesperpixel);
1294 return 0;
1295 }
1296
1297 /* for some reason, we can't do this in TIFFInitLogL16 */
1298 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1299 sp->user_datafmt = LogL16GuessDataFmt(td);
1300 switch (sp->user_datafmt) {
1301 case SGILOGDATAFMT_FLOAT:
1302 sp->pixel_size = sizeof (float);
1303 break;
1304 case SGILOGDATAFMT_16BIT:
1305 sp->pixel_size = sizeof (int16);
1306 break;
1307 case SGILOGDATAFMT_8BIT:
1308 sp->pixel_size = sizeof (uint8);
1309 break;
1310 default:
1311 TIFFErrorExt(tif->tif_clientdata, module,
1312 "No support for converting user data format to LogL");
1313 return (0);
1314 }
1315 if( isTiled(tif) )
1316 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1317 else if( td->td_rowsperstrip < td->td_imagelength )
1318 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1319 else
1320 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1321 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1322 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1323 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1324 return (0);
1325 }
1326 return (1);
1327 }
1328
1329 static int
LogLuvGuessDataFmt(TIFFDirectory * td)1330 LogLuvGuessDataFmt(TIFFDirectory *td)
1331 {
1332 int guess;
1333
1334 /*
1335 * If the user didn't tell us their datafmt,
1336 * take our best guess from the bitspersample.
1337 */
1338 #define PACK(a,b) (((a)<<3)|(b))
1339 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1340 case PACK(32, SAMPLEFORMAT_IEEEFP):
1341 guess = SGILOGDATAFMT_FLOAT;
1342 break;
1343 case PACK(32, SAMPLEFORMAT_VOID):
1344 case PACK(32, SAMPLEFORMAT_UINT):
1345 case PACK(32, SAMPLEFORMAT_INT):
1346 guess = SGILOGDATAFMT_RAW;
1347 break;
1348 case PACK(16, SAMPLEFORMAT_VOID):
1349 case PACK(16, SAMPLEFORMAT_INT):
1350 case PACK(16, SAMPLEFORMAT_UINT):
1351 guess = SGILOGDATAFMT_16BIT;
1352 break;
1353 case PACK( 8, SAMPLEFORMAT_VOID):
1354 case PACK( 8, SAMPLEFORMAT_UINT):
1355 guess = SGILOGDATAFMT_8BIT;
1356 break;
1357 default:
1358 guess = SGILOGDATAFMT_UNKNOWN;
1359 break;
1360 #undef PACK
1361 }
1362 /*
1363 * Double-check samples per pixel.
1364 */
1365 switch (td->td_samplesperpixel) {
1366 case 1:
1367 if (guess != SGILOGDATAFMT_RAW)
1368 guess = SGILOGDATAFMT_UNKNOWN;
1369 break;
1370 case 3:
1371 if (guess == SGILOGDATAFMT_RAW)
1372 guess = SGILOGDATAFMT_UNKNOWN;
1373 break;
1374 default:
1375 guess = SGILOGDATAFMT_UNKNOWN;
1376 break;
1377 }
1378 return (guess);
1379 }
1380
1381 static int
LogLuvInitState(TIFF * tif)1382 LogLuvInitState(TIFF* tif)
1383 {
1384 static const char module[] = "LogLuvInitState";
1385 TIFFDirectory* td = &tif->tif_dir;
1386 LogLuvState* sp = DecoderState(tif);
1387
1388 assert(sp != NULL);
1389 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1390
1391 /* for some reason, we can't do this in TIFFInitLogLuv */
1392 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1393 TIFFErrorExt(tif->tif_clientdata, module,
1394 "SGILog compression cannot handle non-contiguous data");
1395 return (0);
1396 }
1397 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1398 sp->user_datafmt = LogLuvGuessDataFmt(td);
1399 switch (sp->user_datafmt) {
1400 case SGILOGDATAFMT_FLOAT:
1401 sp->pixel_size = 3*sizeof (float);
1402 break;
1403 case SGILOGDATAFMT_16BIT:
1404 sp->pixel_size = 3*sizeof (int16);
1405 break;
1406 case SGILOGDATAFMT_RAW:
1407 sp->pixel_size = sizeof (uint32);
1408 break;
1409 case SGILOGDATAFMT_8BIT:
1410 sp->pixel_size = 3*sizeof (uint8);
1411 break;
1412 default:
1413 TIFFErrorExt(tif->tif_clientdata, module,
1414 "No support for converting user data format to LogLuv");
1415 return (0);
1416 }
1417 if( isTiled(tif) )
1418 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1419 else if( td->td_rowsperstrip < td->td_imagelength )
1420 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1421 else
1422 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1423 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1424 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1425 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1426 return (0);
1427 }
1428 return (1);
1429 }
1430
1431 static int
LogLuvFixupTags(TIFF * tif)1432 LogLuvFixupTags(TIFF* tif)
1433 {
1434 (void) tif;
1435 return (1);
1436 }
1437
1438 static int
LogLuvSetupDecode(TIFF * tif)1439 LogLuvSetupDecode(TIFF* tif)
1440 {
1441 static const char module[] = "LogLuvSetupDecode";
1442 LogLuvState* sp = DecoderState(tif);
1443 TIFFDirectory* td = &tif->tif_dir;
1444
1445 tif->tif_postdecode = _TIFFNoPostDecode;
1446 switch (td->td_photometric) {
1447 case PHOTOMETRIC_LOGLUV:
1448 if (!LogLuvInitState(tif))
1449 break;
1450 if (td->td_compression == COMPRESSION_SGILOG24) {
1451 tif->tif_decoderow = LogLuvDecode24;
1452 switch (sp->user_datafmt) {
1453 case SGILOGDATAFMT_FLOAT:
1454 sp->tfunc = Luv24toXYZ;
1455 break;
1456 case SGILOGDATAFMT_16BIT:
1457 sp->tfunc = Luv24toLuv48;
1458 break;
1459 case SGILOGDATAFMT_8BIT:
1460 sp->tfunc = Luv24toRGB;
1461 break;
1462 }
1463 } else {
1464 tif->tif_decoderow = LogLuvDecode32;
1465 switch (sp->user_datafmt) {
1466 case SGILOGDATAFMT_FLOAT:
1467 sp->tfunc = Luv32toXYZ;
1468 break;
1469 case SGILOGDATAFMT_16BIT:
1470 sp->tfunc = Luv32toLuv48;
1471 break;
1472 case SGILOGDATAFMT_8BIT:
1473 sp->tfunc = Luv32toRGB;
1474 break;
1475 }
1476 }
1477 return (1);
1478 case PHOTOMETRIC_LOGL:
1479 if (!LogL16InitState(tif))
1480 break;
1481 tif->tif_decoderow = LogL16Decode;
1482 switch (sp->user_datafmt) {
1483 case SGILOGDATAFMT_FLOAT:
1484 sp->tfunc = L16toY;
1485 break;
1486 case SGILOGDATAFMT_8BIT:
1487 sp->tfunc = L16toGry;
1488 break;
1489 }
1490 return (1);
1491 default:
1492 TIFFErrorExt(tif->tif_clientdata, module,
1493 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1494 td->td_photometric, "must be either LogLUV or LogL");
1495 break;
1496 }
1497 return (0);
1498 }
1499
1500 static int
LogLuvSetupEncode(TIFF * tif)1501 LogLuvSetupEncode(TIFF* tif)
1502 {
1503 static const char module[] = "LogLuvSetupEncode";
1504 LogLuvState* sp = EncoderState(tif);
1505 TIFFDirectory* td = &tif->tif_dir;
1506
1507 switch (td->td_photometric) {
1508 case PHOTOMETRIC_LOGLUV:
1509 if (!LogLuvInitState(tif))
1510 break;
1511 if (td->td_compression == COMPRESSION_SGILOG24) {
1512 tif->tif_encoderow = LogLuvEncode24;
1513 switch (sp->user_datafmt) {
1514 case SGILOGDATAFMT_FLOAT:
1515 sp->tfunc = Luv24fromXYZ;
1516 break;
1517 case SGILOGDATAFMT_16BIT:
1518 sp->tfunc = Luv24fromLuv48;
1519 break;
1520 case SGILOGDATAFMT_RAW:
1521 break;
1522 default:
1523 goto notsupported;
1524 }
1525 } else {
1526 tif->tif_encoderow = LogLuvEncode32;
1527 switch (sp->user_datafmt) {
1528 case SGILOGDATAFMT_FLOAT:
1529 sp->tfunc = Luv32fromXYZ;
1530 break;
1531 case SGILOGDATAFMT_16BIT:
1532 sp->tfunc = Luv32fromLuv48;
1533 break;
1534 case SGILOGDATAFMT_RAW:
1535 break;
1536 default:
1537 goto notsupported;
1538 }
1539 }
1540 break;
1541 case PHOTOMETRIC_LOGL:
1542 if (!LogL16InitState(tif))
1543 break;
1544 tif->tif_encoderow = LogL16Encode;
1545 switch (sp->user_datafmt) {
1546 case SGILOGDATAFMT_FLOAT:
1547 sp->tfunc = L16fromY;
1548 break;
1549 case SGILOGDATAFMT_16BIT:
1550 break;
1551 default:
1552 goto notsupported;
1553 }
1554 break;
1555 default:
1556 TIFFErrorExt(tif->tif_clientdata, module,
1557 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1558 td->td_photometric, "must be either LogLUV or LogL");
1559 break;
1560 }
1561 sp->encoder_state = 1;
1562 return (1);
1563 notsupported:
1564 TIFFErrorExt(tif->tif_clientdata, module,
1565 "SGILog compression supported only for %s, or raw data",
1566 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1567 return (0);
1568 }
1569
1570 static void
LogLuvClose(TIFF * tif)1571 LogLuvClose(TIFF* tif)
1572 {
1573 LogLuvState* sp = (LogLuvState*) tif->tif_data;
1574 TIFFDirectory *td = &tif->tif_dir;
1575
1576 assert(sp != 0);
1577 /*
1578 * For consistency, we always want to write out the same
1579 * bitspersample and sampleformat for our TIFF file,
1580 * regardless of the data format being used by the application.
1581 * Since this routine is called after tags have been set but
1582 * before they have been recorded in the file, we reset them here.
1583 * Note: this is really a nasty approach. See PixarLogClose
1584 */
1585 if( sp->encoder_state )
1586 {
1587 /* See PixarLogClose. Might avoid issues with tags whose size depends
1588 * on those below, but not completely sure this is enough. */
1589 td->td_samplesperpixel =
1590 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1591 td->td_bitspersample = 16;
1592 td->td_sampleformat = SAMPLEFORMAT_INT;
1593 }
1594 }
1595
1596 static void
LogLuvCleanup(TIFF * tif)1597 LogLuvCleanup(TIFF* tif)
1598 {
1599 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1600
1601 assert(sp != 0);
1602
1603 tif->tif_tagmethods.vgetfield = sp->vgetparent;
1604 tif->tif_tagmethods.vsetfield = sp->vsetparent;
1605
1606 if (sp->tbuf)
1607 _TIFFfree(sp->tbuf);
1608 _TIFFfree(sp);
1609 tif->tif_data = NULL;
1610
1611 _TIFFSetDefaultCompressionState(tif);
1612 }
1613
1614 static int
LogLuvVSetField(TIFF * tif,uint32 tag,va_list ap)1615 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1616 {
1617 static const char module[] = "LogLuvVSetField";
1618 LogLuvState* sp = DecoderState(tif);
1619 int bps, fmt;
1620
1621 switch (tag) {
1622 case TIFFTAG_SGILOGDATAFMT:
1623 sp->user_datafmt = (int) va_arg(ap, int);
1624 /*
1625 * Tweak the TIFF header so that the rest of libtiff knows what
1626 * size of data will be passed between app and library, and
1627 * assume that the app knows what it is doing and is not
1628 * confused by these header manipulations...
1629 */
1630 switch (sp->user_datafmt) {
1631 case SGILOGDATAFMT_FLOAT:
1632 bps = 32;
1633 fmt = SAMPLEFORMAT_IEEEFP;
1634 break;
1635 case SGILOGDATAFMT_16BIT:
1636 bps = 16;
1637 fmt = SAMPLEFORMAT_INT;
1638 break;
1639 case SGILOGDATAFMT_RAW:
1640 bps = 32;
1641 fmt = SAMPLEFORMAT_UINT;
1642 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1643 break;
1644 case SGILOGDATAFMT_8BIT:
1645 bps = 8;
1646 fmt = SAMPLEFORMAT_UINT;
1647 break;
1648 default:
1649 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1650 "Unknown data format %d for LogLuv compression",
1651 sp->user_datafmt);
1652 return (0);
1653 }
1654 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1655 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1656 /*
1657 * Must recalculate sizes should bits/sample change.
1658 */
1659 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1660 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1661 return (1);
1662 case TIFFTAG_SGILOGENCODE:
1663 sp->encode_meth = (int) va_arg(ap, int);
1664 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1665 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1666 TIFFErrorExt(tif->tif_clientdata, module,
1667 "Unknown encoding %d for LogLuv compression",
1668 sp->encode_meth);
1669 return (0);
1670 }
1671 return (1);
1672 default:
1673 return (*sp->vsetparent)(tif, tag, ap);
1674 }
1675 }
1676
1677 static int
LogLuvVGetField(TIFF * tif,uint32 tag,va_list ap)1678 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1679 {
1680 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1681
1682 switch (tag) {
1683 case TIFFTAG_SGILOGDATAFMT:
1684 *va_arg(ap, int*) = sp->user_datafmt;
1685 return (1);
1686 default:
1687 return (*sp->vgetparent)(tif, tag, ap);
1688 }
1689 }
1690
1691 static const TIFFField LogLuvFields[] = {
1692 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1693 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1694 };
1695
1696 int
TIFFInitSGILog(TIFF * tif,int scheme)1697 TIFFInitSGILog(TIFF* tif, int scheme)
1698 {
1699 static const char module[] = "TIFFInitSGILog";
1700 LogLuvState* sp;
1701
1702 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1703
1704 /*
1705 * Merge codec-specific tag information.
1706 */
1707 if (!_TIFFMergeFields(tif, LogLuvFields,
1708 TIFFArrayCount(LogLuvFields))) {
1709 TIFFErrorExt(tif->tif_clientdata, module,
1710 "Merging SGILog codec-specific tags failed");
1711 return 0;
1712 }
1713
1714 /*
1715 * Allocate state block so tag methods have storage to record values.
1716 */
1717 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1718 if (tif->tif_data == NULL)
1719 goto bad;
1720 sp = (LogLuvState*) tif->tif_data;
1721 _TIFFmemset((void*)sp, 0, sizeof (*sp));
1722 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1723 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1724 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1725 sp->tfunc = _logLuvNop;
1726
1727 /*
1728 * Install codec methods.
1729 * NB: tif_decoderow & tif_encoderow are filled
1730 * in at setup time.
1731 */
1732 tif->tif_fixuptags = LogLuvFixupTags;
1733 tif->tif_setupdecode = LogLuvSetupDecode;
1734 tif->tif_decodestrip = LogLuvDecodeStrip;
1735 tif->tif_decodetile = LogLuvDecodeTile;
1736 tif->tif_setupencode = LogLuvSetupEncode;
1737 tif->tif_encodestrip = LogLuvEncodeStrip;
1738 tif->tif_encodetile = LogLuvEncodeTile;
1739 tif->tif_close = LogLuvClose;
1740 tif->tif_cleanup = LogLuvCleanup;
1741
1742 /*
1743 * Override parent get/set field methods.
1744 */
1745 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1746 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1747 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1748 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1749
1750 return (1);
1751 bad:
1752 TIFFErrorExt(tif->tif_clientdata, module,
1753 "%s: No space for LogLuv state block", tif->tif_name);
1754 return (0);
1755 }
1756 #endif /* LOGLUV_SUPPORT */
1757
1758 /* vim: set ts=8 sts=8 sw=8 noet: */
1759 /*
1760 * Local Variables:
1761 * mode: c
1762 * c-basic-offset: 8
1763 * fill-column: 78
1764 * End:
1765 */
1766